STIHL 320 Series Owner's manual

Brand: STIHL

Model: 320 Series

Category: Garden tools

Type: Owner's manual

This manual is also suitable for

STIHL BR 320, 400

Instruction Manual

Owner's Manual

Assembling

Safety Precautions

Operating Instructions

Maintenance

Parts and Controls 2

Safety Precautions 4

Assembling the Blower 10

Using the Blower 11

Fuel 12

Fueling 13

Starting 14

Cleaning the Air Filter 16

Adjusting the Carburetor 16

Motormanagement 16

Checking the Spark Plug 18

Spark Arresting Screen in Muffler 19

Replacing the Starter Rope

and Rewind Spring 20

Operating Instructions 23

Storing the Machine 23

Maintenance Chart 24

Specifications 25

STIHL Incorporated Federal and

California Emission Control Warranty

Statement 27

This Manual contains operating and

safety instructions for all STIHL BR 320,

BR 320 L, BR 400 blowers.

Pay special attention to the safety

precautions outlined on pages 4 to 9.

Allow only persons who understand this

Manual to operate your blower.

To receive maximum performance and

satisfaction from your STIHL blower, it is

important that you read and understand

the maintenance and safety precautions

before using your blower.

Contact your STIHL dealer or the STIHL

distributor for your area if you do not

understand any of the instructions in this

Manual.

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Because a blower is a high-speed tool,

some special safety precautions must

be observed as with any other power

tool to reduce the risk of personal injury.

Careless or improper use may cause

serious or even fatal injury.

STIHL’s philosophy is to continually

improve all of its products. As a result,

engineering changes and improvements

are made from time-to-time.

If the operating characteristics or the

appearance of your blower differ from

those described in this Manual, please

contact your STIHL dealer for information

and assistance.

0458 353 3021. M10. L9. PM. Printed in USA

 1999 Andreas Stihl AG & Co., Waiblingen

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Printed on chlorine-free paper

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1 = Nozzle

2 = Blower tube

3 = Control handle

4 = Throttle trigger

5 = Setting lever

6 = Stop switch

7 = Pleated hose

8 = Harness

9 = Back plate

10 = Back padding

11 = Air filter

12 = Rubber buffers

13 = Spark plug boot

14 =Muffler (with spark

arresting screen)

15 =Carburetor adjusting screws

16 = Choke knob

17 = Starter grip

18 =Fuel filler cap

✽= Serial number

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353BA031

353BA032

033 KN

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Aims and widens the spray or

airstream.

 %ORZHUWXEH

Directs spray or airstream.

 &RQWUROKDQGOH

Handle on the flexible hose to hold

and direct the tube in the required

direction.

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Controls the speed of the engine.

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Sets the trottle to various positions.

 6WRSVZLWFK

Stops engine.

 3OHDWHGKRVH

For spraying, dusting or spreading

in the desired direction.

 +DUQHVV

For carrying the unit.

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Helps protect the back of the user.

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Increases carrying comfort.

 $LUILOWHUFRYHU

Cover the air filter element.

 5XEEHUEXIIHUV

Elements designed to reduce the

transmission of vibrations created

by the engine to the operators back.

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Connects the spark plug to the

ignition wire.

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Attenuates exhaust noises and

diverts exhaust gases away from

operator.

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For tuning carburetor.

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Eases engine starting by enrichting

mixture.

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The grip of the pull starter, which is

the device to start the engine.

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For closing the fuel tank.

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The use of any blower may

be dangerous. It is important

that you read, fully under-

stand and observe the follow-

ing safety precautions and warnings.

Reread the owner‘s manual

and the safety instructions

periodically.

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Careless or improper use of the ma-

chine may cause serious injury. Have

your STIHL Dealer show you how to

operate your blower. Observe all applica-

ble local safety regulations, standards

and ordinances.

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Minors should never be allowed to use a

blower : Bystanders, especially children,

and animals should not be allowed in the

area where a machine is in use.

Never let the unit run unattended.

Do not lend or rent your machine without

the owner‘s manual. Be sure that

anyone using your unit understands the

information contained in this manual.

Most of these safety precautions and

warnings apply to the use of all STIHL

blowers. Different models may have

different parts and controls. See the

appropriate section of your owner‘s

manual for a description of the controls

and function of the parts of your

machine.

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1. the operator

2. the blower

3. the use of the blower .

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You must be in good physical condition

and mental health and not under the

influence of any substance (drugs,

alcohol, etc.) which might impair vision,

dexterity or judgment. Do not operate a

blower when you are fatigued .

Be alert - if you get tired while operating

your machine, take a break. Tiredness

may result in loss of control. Working

with any blower can be strenuous. If

you have any condition that might be

aggravated by strenuous work, check

with your doctor before operating the

machine.

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Prolonged use of a blower, (or other

machines) exposing the operator to

vibrations may produce whitefinger

disease (Raynaud‘s phenomenon) or

carpal tunnel syndrome. These con-

ditions reduce the hand‘s ability to feel

and regulate temperature, produce

numbness and burning sensations

and may cause nerve and circulation

damage and tissue necrosis.

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The STIHL BR 320, 400 is equipped

with an antivibration system (AV). The

AV system is designed to reduce the

transmission of engine vibrations to the

operator’s hands. An AV system is

recommended for those operators who

use blowers on a regular or sustained

basis.

Antivibration systems do not guarantee

that you will not sustain whitefinger

disease or carpal tunnel syndrome.

Therefore, continual and regular users

should monitor closely the condition of

their hands and fingers. If any of the

above symptoms appear, seek medical

advice immediately.

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Clothing must be sturdy and snug-fitting,

but allow complete freedom of move-

ment. Avoid loose-fitting jackets, flared

or cuffed pants, scarfs, unconfined long

hair or anything that could be drawn into

the air intake.

Wear overalls or long

pants to protect your legs.

Do not wear shorts.

Use of gloves when

working with the blower

is recommended.

Good footing is most important. Wear

sturdy shoes with nonslip soles.

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To reduce the risk of injury associated

with the inhalation of dust, use a face

filter mask when using your blower in

dusty conditions.

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Proper eye protection is a must. Even

though the discharge is directed away

from the operator, ricochets and

bounce-backs can occur during blower

operations.

Never operate a blower

unless wearing goggles or

properly fitted safety glasses

with adequate top and side

protection which comply with

ANSI Z 87.1 (or your appli-

cable national standard).

Blower noise may damage your hearing.

Wear sound barriers (ear plugs or ear

mufflers) to protect your hearing.

Continual and regular users should have

their hearing checked regulary.

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For illustrations and definitions of the

blower parts see the chapter on "Parts

and Controls"!

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Never modify a blower in any way. Only

attachments supplied by STIHL or

expressly approved by STIHL for use

with the specific STIHL blower models

are authorized. Although certain un-

authorized attachment are useable for

the STIHL blower, their use may be

extremely dangerous.

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Always turn off the engine before taking

the machine off your back and putting it

down. When transporting your unit in a

vehicle, properly secure it to prevent

turnover, fuel spillage and damage to

the machine.

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Before starting work, always inspect the

rubber buffers which connect the engine

to the pack frame. If the buffers are torn

or damaged, they should be replaced by

your STIHL dealer. Failure of one or

more buffers may cause the engine or

fuel tank to hit or rub against other parts,

and may lead to serious injury from

increased vibrations or from fire as the

result of fuel leakage.

Adjust carrying harness to suit your size

before starting work.

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This STIHL unit uses an oil-gasoline

mixture for fuel (see the chapter on

"Fuel" of your owner‘s manual).

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Gasoline is an extremely

flammable fuel. If spilled

or ignited by a spark or

other ignition source, it

can cause fire and

serious burn injury or property damage.

Use extreme caution when handling

gasoline or fuel mix.

Do not smoke or bring any fire or flame

near the fuel.

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Fuel your machine in well-ventilated

areas, outdoors only. Always shut off the

engine and allow it to cool before refuel-

ing. Relieve fuel tank pressure by

loosening fuel cap slowly. Never remove

fuel filler cap while engine is running.

Select bare ground for fueling and move

at least 10 feet (3 m) from the fueling

spot before starting the engine. Wipe

off any spilled fuel before starting your

blower and check for leakage.

Always tighten fuel filler cap securely

after fueling.

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To reduce the risk of serious injury from

burns, never attempt to refuel the unit

until it has been completely removed

from the operator.

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Check for fuel leakage while refueling

and during operation. If fuel or oil

leakage is found, do not start or run the

engine until leak is fixed and spilled fuel

has been wiped away. Take care not to

get fuel on your clothing. If this happens,

change your clothing immediately.

Always store gasoline in approved

container.

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Unit vibrations can cause an improperly

tightened fuel cap to loosen or come off

and spill quantities of fuel. In order to

reduce risk of fuel spillage and fire,

tighten fuel cap by hand with as much

force as possible.

The screw driver end of

the STIHL combination

wrench or other similar

tool can be used as an aid

in tightening slotted fuel

caps.

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You should always inspect your unit

before starting it. Make sure the controls

and safety devices are working properly.

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Your blower is a one-person machine.

To reduce the risk of eye or other injury

from thrown objects, insure that by-

standers are at least 50 feet (15m) away

during use.

Stop the engine immediately if you are

approached.

The assistance of another person may

be needed in placing the unit on your

back after starting. In order to reduce the

risk of injury to the assistant from thrown

objects or from contact with fumes, the

engine should be kept at idle speed dur-

ing this brief period, and your assistant

should not stand in the area of the outlet

nozzle or exhaust. Otherwise, the unit

should be started and operated without

assistance.

For specific starting instructions, see the

appropriate section of your owner‘s

manual. Place the machine on firm

ground or other solid surface in an open

area. Maintain good balance and secure

footing.

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When you pull the starter grip, don‘t

wrap the starter rope around your hand.

Do not allow the grip to snap back, but

guide the starter rope slowly back to

permit the rope to rewind properly.

Failure to follow this procedure may

result in injury to hand or fingers and

may damage the starter mechanism.

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Never operate your machine if it is

damaged, improperly adjusted or not

completely and securely assembled.

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Start and operate your unit outdoors in a

ventilated area.

Keep the space behind the engine clear

at all times to allow for the escape of hot

and toxic exhaust fumes.

Operate your machine under good

visibility and daylight conditions only.

Work carefully.

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When working with the blower, always

wear it on your back using the carrying

harness. Wrap your fingers tightly

around the handle, keeping the control

handle cradled between your thumb and

forefinger. Keep your hand in this

position to have your machine under

control at all times.

Make sure your control handle and grip

is in good condition and free of moisture,

pitch, oil or grease.

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To reduce the risk of personal injury, do

not direct air blast towards bystanders,

since the high pressure of the air flow

could injure eyes and could blow small

objects at great speed.

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Your blower produces

poisonous exhaust fumes

as soon as the combus-

tible engine is running.

These gases (e.g. carbon

monoxide) may be color-

less and odorless.

To reduce the risk of serious or fatal

injury from breathing toxic fumes, never

run the blower indoors or in poorly venti-

lated locations. Ensure proper ventilation

when working in trenches or other con-

fined areas.

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Use of this product can generate dust,

mists, and fumes containing chemicals

known to cause respiratory disease,

cancer, birth defects, or other reproduc-

tive harm. If you are unfamiliar with the

risks associated with the particular dust,

mists or fumes at issue, consult your

employer, governmental agencies such

as OSHA and NIOSH and other sources

on hazardous materials. If the substance

being blown or vacuumed is a commer-

cial substance, review the material

safety data sheet for that substance and

/ or consult the material manufacturer /

supplier. The state of California and

some other authorities, for instance,

have published lists of substances

known to cause cancer, reproductive

toxicity, etc.

Control dust, mist and fumes at the

source where possible. In this regard

use good work practices and follow the

recommendations of OSHA / NIOSH

and occupational and trade associa-

tions. When the inhalation of toxic dust,

mists and fumes cannot be eliminated,

the operator and any bystanders should

always wear a respirator approved by

NIOSH / MSHA for the substance at

issue.

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Dust with silica in its composition may

contain crystalline silica. Silica is a basic

component of sand, quartz, brick, clay,

granite and numerous other minerals

and rocks, including masonry and con-

crete products. Repeated and / or sub-

stantial inhalation of airborne crystalline

silica can cause serious or fatal respira-

tory disease, including silicosis. In addi-

tion, the state of California and some

other authorities have listed respirable

crystalline silica as a substance known

to cause cancer. When encountering

such materials, always follow the re-

spiratory precautions mentioned above.

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Breathing asbestos dust is dangerous

and can cause severe or fatal injury, re-

spiratory illness or cancer. The use and

disposal of asbestos containing products

have been strictly regulated by OSHA

and the Environmental Protection

Agency. Do not blow or disturb asbestos

or asbestos containing products, such

as asbestos insulation. If you have any

reason to believe that you might be

disturbing asbestos, immediately contact

your employer or a local OSHA

representative.

353BA038 L

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Always shut off the engine before

cleaning or servicing the unit or

replacing parts.

Never insert any foreign object into the

air intake of the machine or into the

nozzle of the blower. It wil damage the

fan wheel and may cause serious injury

to the operator or bystanders as a result

of the object or broken

parts being

thrown out at high speed.

Do not place the blower on the ground

when operating at high speed, because

small objects such as sand, gras, dust,

etc. may be pulled into the air intake and

damage the fan wheel.

In the event of the machine catching fire

(for whatever reason) throw it off quickly

by releasing the spring catches on both

sides of the harness.

In an emergency, you may slip out of the

harness and throw off the machine

quickly by first releasing the lap belt -

on machines that are so equipped -

and then lifting the tabs of the two sliding

harness adjusters to slacken the shoul-

der straps. Try this procedure a number

of times before using the machine in

order to become accustomed with it.

Pay attention to the direction of the wind,

i.e., do not work against the wind.

To reduce the risk of stumbling and loss

of control, do not walk backward while

operating the machine.

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The blower may be used only for the

operations described in your manual.

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The STIHL blower can be used for

clearing leaves and grass clippings from

gardens and driveways and can also be

used for blow-sweeping paper, trash,

dust, light snow etc. from large areas,

sport stadiums or parks.

Gravel paths and walks, gravel-covered

flat roofs, ditches etc. can be blow-swept

quickly.

Other applications are blowing out pipes,

drains, gutters and your carport.

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(special accessory)

The vacuum is designed to pick up dry

material such as leaves, grass, small

twigs and bits of paper.

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To reduce the risk of personal injury

from fire and explosion, never attempt to

pick up hot or burning substances (e.g.

smoldering ashes, glowing cigarettes) or

combustible fluids (e.g. gasoline, paint

thinners).

326BA003 L

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Use only identical STIHL replacement

parts for maintenance and repair.

Use of parts manufactured by others

may cause serious or fatal injury.

Follow the maintenance and repair

instructions in the appropriate section of

your owner’s manual. Refer to the

maintenance chart at the end of this

manual.

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Always stop the engine and make sure

that the fan is stopped before doing any

maintenance or repair work or cleaning

the blower. Do not attempt any main-

tenance or repair work not described in

your owner’s manual. Have such work

performed at your STIHL service shop

only.

Check fuel filler cap for leaks at regular

intervals. Use the specified spark plug

and make sure it and the ignition lead

are always in good condition.

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A worn or damaged muffler is a fire

hazard and may cause loss of hearing.

Check to see that the muffler is in good

condition. The blower must not be

operated if the muffler is not functioning

properly or has been removed.

Remember that the risk of forest fires is

greater in hot weather. Use the spark

arresting muffler supplied with the unit.

Never touch a hot muffler or burn will

result.

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In order to reduce the risk of fire, do not

modify or remove any part of the muffler

or spark arrestor.

Tighten all nuts, bolts and screws except

the carburetor adjustment screws after

each use.

Keep spark plug and wire connection

tight and clean. The spark plug electrode

gap should be checked with a feeler

gauge at least every 50 operating hours

and reset if necessary. Fit a new spark

plug if the electrodes are badly pitted.

Store blower in a dry, high or locked

location place and out of reach of

children.

Before storing for longer than a few

days, always empty the fuel tank.

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For any maintenance please refer to the

maintenance chart DQGWRWKHZDUUDQW\

VWDWHPHQW near the end of this manual.

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Tools are stowed on the underside of

the blower (one combination wrench and

one carburetor screwdriver)

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•

Line up the stops on the elbow 

and fan housing stub .

•

Push the elbow  into the stub 

as far as it will go

•

Fit the nut  into the hexagon

recess on the stub.

•

Insert the screw in the nut from the

other side and tighten moderately -

the elbow must still turn.

Important: The throttle cable is already

connected and must not be kinked

during assembly.

•

Secure throttle cable  to the

pleated hose with the retainer .

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•

Push the blower tube  into the

pleated hose .

•

Push blower tube  onto the end

of tube  and rotate it clockwise to

engage the bayonet coupling.

•

Push the nozzle  onto the end

of blower tube  and rotate it

clockwise to engage the bayonet

coupling.

•

Rotate the pleated hose  counter-

clockwise as far as the stop and

leave it in that position.

•

Turn the control handle  to the

horizontal position.

•

Now rotate the complete blower

tube until the nozzle points in the

same direction as the control

handle.

•

Tighten down the clamp screw .

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353BA002

353BA003

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•

Put the unit on your back.

•

Release the clamp screw .

•

Slide the control handle  along

the pleated hose to the most

comfortable position.

•

Retighten the clamp screw .

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•

Pull the ends of the straps

downward to tighten the harness.

•

Lift the tabs of the two sliding

adjusters to slacken the harness

straps.

•

Adjust the straps so that the back-

plate is held firmly and comfortably

against your back.

The BR 320/400 blower is designed for

single-handed operation. It is carried as

a backpack and operated with the right

hand on the control handle.

The powerful ground-level airstream

can be aimed highly accurately and

effectively. It enables the operator to

quickly blow-sweep large areas.

The blower can be used for clearing

leaves, grass, paper, dust and light

snow in gardens, sports stadiums,

parks, driveways and parking lots. It is

also suitable for drying cars and clearing

forest paths.

353BA004

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The vacuum attachment is used to pick

up leaves, grass and other materials.

Even big leaves, pieces of cardboard

and bark fit through the large diameter

suction tube.

Take particular care when vacuuming

GDPS leaves as they may clog the fan.

Never pick up hot or burning substances,

e.g. smoldering ashes, glowing

cigarettes. Never vacuum close to a fire

or other naked flames.

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To minimize blowing time, use rakes

and brooms to loosen debris before

blowing.

Recommended working techniques to

minimize airborne debris and pollution:

•

In dusty conditions, slightly dampen

surfaces.

•

Use the full blower nozzle exten-

sion so the airstream can work

close to the ground.

•

Do not direct debris at subjects

such as open windows or freshly-

washed cars.

•

After using blowers, clean up. Do

not blow debris onto neighbouring

properties.

Recommended working techniques to

minimize noise:

•

Operate power equipment only at

reasonable hours - not early in the

morning, late at night or during the

noon-break when people might be

disturbed. Comply with times listed

in local ordinances. Usual recom-

mendations are 9:00 a.m. to 12:00

a.m. and 03:00 p.m. to 5:00 p.m. on

workdays for professionals. Special

considerations should be given to

neighbours on weekends.

•

Fewer engines mean less noise;

therefore use only one piece of

power equipment at a time, when

possible.

•

Operate power blowers at the

lowest possible throttle speed to do

the job.

•

Check your equipment before

operation, especially the muffler, air

intakes and air filters.

Conserve water by using power blowers

instead of hoses for those lawn and

garden applications where a blower can

be properly used, such as cleaning

patios or porches.

)XHO

This engine is certified to operate on

unleaded gasoline and with the

mix ratio 50:1.

Your two-stroke engine requires a

mixture of brand-name gasoline and

quality two-stroke engine oil with the

classification TC.

Use regular branded unleaded gasoline

with a minimum octane rating of

90 RON (U.S.A./Canada: pump octane

min. 89!). If the octane number of the

regular grade gasoline in your area is

lower use premium unleaded fuel.

Fuel with a lower octane rating may

result in preignition (causing "pinging")

which is accompanied by an increase in

engine temperature. This, in turn,

increases the risk of the piston seizure

and damage to the engine.

The chemical composition of the fuel is

also important. Some fuel additives not

only detrimentally affect elastomers

(carburetor diaphragms, oil seals, fuel

lines etc.), but magnesium castings as

well. This could cause running problems

or even damage the engine. For this

reason it is essential that you use only

name branded fuels!

Use only STIHL two-stroke engine oil or

equivalent branded two-stroke air-

cooled engine oils with the classification

TC for mixing.

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353BA009

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353BA008

We recommend STIHL 50:1 two-stroke

engine oil since it is specially formulated

for use in STIHL engines.

Do not use BIA or TCW (two-stroke

water cooled) mix oils!

Take care when handling gasoline.

Avoid direct contact with the skin and

avoid inhaling fuel vapour.

The canister should be kept tightly

closed in order to avoid any moisture

getting into the mixture.

The fuel tank and the canister in which

fuel mix is stored should be cleaned

from time to time.

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Only mix sufficient fuel for a few days

work, not to exceed 3 months of storage.

Store in approved safety fuel-canisters

only. When mixing, pour oil into the

canister first, and then add gasoline.

Gaso- Oil (STIHL 50:1 or

line equivalent branded TC oils)

US gal. US fl.oz

1 2.6

2 1/2 6.4

512.8

Dispose empty mixing-oil canisters only

at authorized disposal locations.

Before fueling, clean the filler cap

and the area around it to ensure that no

dirt falls into the tank.

Always thoroughly shake the mixture in

the canister before fueling your machine.



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In order to reduce the risk of burns or

other personal injury from escaping gas

vapor and fumes, remove the fuel filler

cap carefully so as to allow any pressure

build-up in the tank to release slowly.

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After fueling, tighten fuel cap

as securely as possible by hand.

Change the fuel pick up body every year.

Before storing your machine for a long

period, drain and clean the fuel tank and

run engine until carburetor is dry.

%5 

Observe safety precautions - see chap-

ter "Safety Precautions" in this manual.

•

Slide the stop switch  to

•

Move the setting lever  to 

the center position -

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The setting lever can be used to select

any throttle opening between idle speed

(lower stop) and full throttle (upper stop).

Set the lever to idle speed before

shutting down the engine.

•

f the engine is FROG, turn the

choke knob to N

•

If the engine is ZDUP, turn the

choke knob to H

Also use this position if the engine

has ben running but is still cold.

•

Put the unit on the ground.

Check that bystanders are well

clear of the general work area and

the nozzle.

•

Make sure you have a firm footing:

Hold the unit with your left hand on

the housing and put one foot

against the base plate to prevent it

slipping.

•

Pull the starter grip slowly with your

right hand until you feel it engage

and then give it a brisk strong pull.

Do not pull the starter rope out

more than 75cm (30") as it might

otherwise break.

•

Do not let the starter grip snap back.

•

Guide it slowly back into the

housing so that the starter rope can

rewind properly.

353BA010

353BA014

353BA011

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•

If engine is FROG:

Turn choke toH

and continue cranking until engine

runs.

•

If engine is ZDUP:

Continue cranking until engine runs.

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•

Move the setting lever  to its

lower end position so that engine

settles down to idle speed.

7RVWRSWKHHQJLQH

•

Slide the stop switch  to 

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•

As soon as engine runs:

•

Move the setting lever to its lower

stop - the engine returns to idling

speed.

•

Open throttle slightly - warm up

engine for a short period.

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If you did not turn the choke

knob to H

quickly enough after the engine

began to fire, the combustion

chamber has flooded.

•

Remove spark plug boot.

•

Unscrew and dry off the

spark plug.

•

Set the stop switch to .

•

Open the throttle fully.

•

Pull the starter rope several times

to clear the combustion chamber.

•

Refit the spark plug and connect

the spark plug boot.

•

Set stop switch to 

•

Turn choke knob to H

even if the engine is cold.

•

Now start the engine.

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•

Pull starter rope several times to

prime the fuel pump and fuel line.

•

Now start the engine.

353BA016

353BA015

353BA017

%5 

Dirty air filters reduce engine power,

increase fuel consumption and make

starting more difficult.

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SRZHU

•

Turn choke knob to J

•

Release the screws  and pull off

the filter cover .

•

Clean away loose dirt from around

the filter.

•

Remove the prefilter  (if fitted)

from the filter element .

•

Wash the prefilter in fresh, non-

flammable cleaning solution (e.g.

warm soapy water) and then dry.

Always replace a damaged filter

element.

•

Take out the filter element  - if it

is dirty, fit a new one.

•

Fit the felt element  in the filter

base .

•

Slide the prefilter  over the filter

element.

•

Fit the filter cover and tighten down

firmly.

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Exaust emissions are controlled by the

design of the fundamental engine para-

meters and components (e.g. carbu-

ration, ignition, timing and valve or part

timing) without the addition of any major

hardware.

The carburetor comes with a standard

setting.

This is the optimum setting to ensure

your machine will operate reliably with

the lowest possible emission under most

operating conditions.

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If it is necessary to readjust the car-

buretor from scratch, first carry out the

standard setting.

Turn

+ high speed adjusting screw and

/ low speed adjusting screw

counterclockwise (richer)

or as far as stop.

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353BA000 KN

353BA043 KN

 %5

If you don‘t have a tachometer, do not

set the highspeed adjusting screw any

leaner by turning it beyond the standard

setting.

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Slight correction PD\ be necessary.

Use a WDFKRPHWHU to set the high speed

adjusting screw + to obtain the highest

possible engine speed. From that

position, turn the high speed adjusting

screw + 1/8 counterclockwise (richer)

or as far as stop. Avoid risk of engine

damage which can be caused by lack of

lubrication and overheating -

•

Check air filter and clean it if

necessary.

•

Set idle speed correctly.

•

Warm up the engine.

Turn the high speed adjusting

screw + and low speed adjusting

screw / clockwise (leaner) at

higher altitudes.

Turn the screws very slowly and

carefully - slight changes have a

noticeable effect on the engine’s

running behavior.

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The high speed adjusting screw +

alters the power output and

maximum off-load engine speed.

If you turn this screw too far clock-

wise and make the setting too lean,

there is a risk of engine damage.

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It is usually necessary to change

the setting of the idle speed

adjusting screw /$ after

every correction to the low

speed adjusting screw /.

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Turn the idle speed adjusting

screw /$ clockwise until

the engine runs smoothly.

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DFFHOHUDWLRQ

Idle setting is too lean.

Turn the low speed adjusting screw

/ counterclockwise until engine

runs and accelerates smoothly.

353BA023

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Wrong fuel mix (too much engine oil in

the gasoline), a dirty air filter and

unfavorable running conditions (mostly

at part throttle etc.) affect the condition of

the spark plug. These factors cause

deposits to form on the insulator nose

which may result in trouble in operation.

If engine is down on power, difficult to

start or runs poorly at idling speed,

first check the spark plug.

•

Remove spark plug -

see chapter “Starting”:

•

Clean dirty spark plug.

•

Check electrode gap -

it should be 0.5mm/0.02" $ -

readjust if necessary.

•

Use only resistor type spark plugs

of the approved range.

Rectify problems which have caused

fouling of spark plug:

Incorrect carburetor setting, too much oil

in fuel mix, dirty air filter,

unfavorable running conditions, e.g.

operating at part load.

000BA036 TR

•

Fit a new spark plug after

approx. 100 operating hours -

or earlier if the electrodes are

badly eroded.

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To reduce the risk of fire and burn injury,

use only spark plugs authorized by

STIHL (see “Specifications”). Always

press spark plug boot  snugly onto

spark plug terminal  of the proper

size. (Note: If terminal has detachable

SAE adapter nut, it must be attached.)

A loose connection between spark plug

terminal and ignition wire connector in

the boot may create arcing that could

ignite combustible fumes and cause a

fire.

000BA039 KN

 %5

If the engine is down on power, check

the spark arresting screen in the muffler.



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Wait until engine has cooled down

completely before performing the

following operations.

•

Take out starter cover mounting

screws .

•

Remove the starter cover .

•

Pull off the spark plug boot .

•

Take out the housing mounting

screws .

•

Remove the housing .

•

Squeeze the ends of the clip 

together and lift the clip away.

•

Take the spark arresting screw 

out of the muffler.

•

Clean the spark arresting screen.

•

If screen is damaged or heavily

carbonized, fit a new one.

•

Install the spark arresting screen .

•

Fit the clip .

•

Place housing  in position.

•

Tighten down housing screws.

•

Fit the spark plug boot .

•

Fit the starter cover .

•

Tighten down the starter cover

screws .

353BA026

7 6

353BA025

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353BA025

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STIHL 320 Series Owner's manual

Brand: STIHL

Model: 320 Series

Category: Garden tools

Type: Owner's manual

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STIHL 320 Series Owner's manual

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STIHL 320 Series Owner's manual

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